<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <div id="test"></div>
  <script type="text/javascript" src="../js/react.development.js"></script>
  <script type="text/javascript" src="../js/react-dom.development.js"></script>
  <script type="text/javascript" src="../js/babel.min.js">
  </script>
  <script src="../js/prop-types.js"></script>
  <script type="text/babel">
    class MyComponent extends React.Component {
      inputRef = React.createRef()
      render() {
        return (
          <input type="text" ref={this.inputRef} onBlur={() => { console.log(this.inputRef.current.value); }} />
        )
      }
    }
    ReactDOM.render(<div><MyComponent /></div>, document.querySelector('#test'))
  </script>
</body>

</html>